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Abstract: Pulse splitting is a crucial and common process in nonlinear fiber optics.When an intense laser pulse is launched into a highly nonlinear fiber, a streamof fundamental solitons is generated, their temporal separations increasingduring propagation. This is due to the onset of a variety of perturbations,including higher-order dispersion and the Raman effect. Recently, it has beenexperimentally observed that the well-known law determining the amplitudes andthe temporal widths of each soliton, however, breaks down due to the unexpectedformation of metastable 2-peak localised states with constant temporalseparation between the two maxima. In the vicinity of certain -magic- inputpowers the formation of 2-peak states is quite common in many types of highlynonlinear photonic crystal fibers. In this study, we provide a full theoreticalunderstanding of the above recent observations. Based on a -gravity-like-potential approach we derive simple equations for the -magic- peak power ratioand the temporal separation between pulses forming these 2-peak states. Wedevelop a model to calculate the magic input power of the input pulse aroundwhich the phenomenon can be observed. We also predict the existence of exoticmultipeak states that strongly violate the perturbative pulse splitting law,and we study their stability and excitation conditions.

Autor: Truong X. Tran, Alexander Podlipenksy, Philip St.J. Russell, Fabio Biancalana


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